net/bridge/br_multicast.c

   1 /*
   2  * Bridge multicast support.
   3  *
   4  * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  *
  11  */
  12
  13 #include <linux/err.h>
  14 #include <linux/export.h>
  15 #include <linux/if_ether.h>
  16 #include <linux/igmp.h>
  17 #include <linux/jhash.h>
  18 #include <linux/kernel.h>
  19 #include <linux/log2.h>
  20 #include <linux/netdevice.h>
  21 #include <linux/netfilter_bridge.h>
  22 #include <linux/random.h>
  23 #include <linux/rculist.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/slab.h>
  26 #include <linux/timer.h>
  27 #include <linux/inetdevice.h>
  28 #include <linux/mroute.h>
  29 #include <net/ip.h>
  30 #include <net/switchdev.h>
  31 #if IS_ENABLED(CONFIG_IPV6)
  32 #include <net/ipv6.h>
  33 #include <net/mld.h>
  34 #include <net/ip6_checksum.h>
  35 #include <net/addrconf.h>
  36 #endif
  37
  38 #include "br_private.h"
  39
  40 static void br_multicast_start_querier(struct net_bridge *br,
  41                                        struct bridge_mcast_own_query *query);
  42 static void br_multicast_add_router(struct net_bridge *br,
  43                                     struct net_bridge_port *port);
  44 static void br_ip4_multicast_leave_group(struct net_bridge *br,
  45                                          struct net_bridge_port *port,
  46                                          __be32 group,
  47                                          __u16 vid,
  48                                          const unsigned char *src);
  49
  50 static void __del_port_router(struct net_bridge_port *p);
  51 #if IS_ENABLED(CONFIG_IPV6)
  52 static void br_ip6_multicast_leave_group(struct net_bridge *br,
  53                                          struct net_bridge_port *port,
  54                                          const struct in6_addr *group,
  55                                          __u16 vid, const unsigned char *src);
  56 #endif
  57 unsigned int br_mdb_rehash_seq;
  58
  59 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
  60 {
  61         if (a->proto != b->proto)
  62                 return 0;
  63         if (a->vid != b->vid)
  64                 return 0;
  65         switch (a->proto) {
  66         case htons(ETH_P_IP):
  67                 return a->u.ip4 == b->u.ip4;
  68 #if IS_ENABLED(CONFIG_IPV6)
  69         case htons(ETH_P_IPV6):
  70                 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
  71 #endif
  72         }
  73         return 0;
  74 }
  75
  76 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip,
  77                                 __u16 vid)
  78 {
  79         return jhash_2words((__force u32)ip, vid, mdb->secret) & (mdb->max - 1);
  80 }
  81
  82 #if IS_ENABLED(CONFIG_IPV6)
  83 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
  84                                 const struct in6_addr *ip,
  85                                 __u16 vid)
  86 {
  87         return jhash_2words(ipv6_addr_hash(ip), vid,
  88                             mdb->secret) & (mdb->max - 1);
  89 }
  90 #endif
  91
  92 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
  93                              struct br_ip *ip)
  94 {
  95         switch (ip->proto) {
  96         case htons(ETH_P_IP):
  97                 return __br_ip4_hash(mdb, ip->u.ip4, ip->vid);
  98 #if IS_ENABLED(CONFIG_IPV6)
  99         case htons(ETH_P_IPV6):
 100                 return __br_ip6_hash(mdb, &ip->u.ip6, ip->vid);
 101 #endif
 102         }
 103         return 0;
 104 }
 105
 106 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
 107         struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
 108 {
 109         struct net_bridge_mdb_entry *mp;
 110
 111         hlist_for_each_entry_rcu(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 112                 if (br_ip_equal(&mp->addr, dst))
 113                         return mp;
 114         }
 115
 116         return NULL;
 117 }
 118
 119 struct net_bridge_mdb_entry *br_mdb_ip_get(struct net_bridge_mdb_htable *mdb,
 120                                            struct br_ip *dst)
 121 {
 122         if (!mdb)
 123                 return NULL;
 124
 125         return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
 126 }
 127
 128 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
 129         struct net_bridge_mdb_htable *mdb, __be32 dst, __u16 vid)
 130 {
 131         struct br_ip br_dst;
 132
 133         br_dst.u.ip4 = dst;
 134         br_dst.proto = htons(ETH_P_IP);
 135         br_dst.vid = vid;
 136
 137         return br_mdb_ip_get(mdb, &br_dst);
 138 }
 139
 140 #if IS_ENABLED(CONFIG_IPV6)
 141 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
 142         struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst,
 143         __u16 vid)
 144 {
 145         struct br_ip br_dst;
 146
 147         br_dst.u.ip6 = *dst;
 148         br_dst.proto = htons(ETH_P_IPV6);
 149         br_dst.vid = vid;
 150
 151         return br_mdb_ip_get(mdb, &br_dst);
 152 }
 153 #endif
 154
 155 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 156                                         struct sk_buff *skb, u16 vid)
 157 {
 158         struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
 159         struct br_ip ip;
 160
 161         if (br->multicast_disabled)
 162                 return NULL;
 163
 164         if (BR_INPUT_SKB_CB(skb)->igmp)
 165                 return NULL;
 166
 167         ip.proto = skb->protocol;
 168         ip.vid = vid;
 169
 170         switch (skb->protocol) {
 171         case htons(ETH_P_IP):
 172                 ip.u.ip4 = ip_hdr(skb)->daddr;
 173                 break;
 174 #if IS_ENABLED(CONFIG_IPV6)
 175         case htons(ETH_P_IPV6):
 176                 ip.u.ip6 = ipv6_hdr(skb)->daddr;
 177                 break;
 178 #endif
 179         default:
 180                 return NULL;
 181         }
 182
 183         return br_mdb_ip_get(mdb, &ip);
 184 }
 185
 186 static void br_mdb_free(struct rcu_head *head)
 187 {
 188         struct net_bridge_mdb_htable *mdb =
 189                 container_of(head, struct net_bridge_mdb_htable, rcu);
 190         struct net_bridge_mdb_htable *old = mdb->old;
 191
 192         mdb->old = NULL;
 193         kfree(old->mhash);
 194         kfree(old);
 195 }
 196
 197 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
 198                        struct net_bridge_mdb_htable *old,
 199                        int elasticity)
 200 {
 201         struct net_bridge_mdb_entry *mp;
 202         int maxlen;
 203         int len;
 204         int i;
 205
 206         for (i = 0; i < old->max; i++)
 207                 hlist_for_each_entry(mp, &old->mhash[i], hlist[old->ver])
 208                         hlist_add_head(&mp->hlist[new->ver],
 209                                        &new->mhash[br_ip_hash(new, &mp->addr)]);
 210
 211         if (!elasticity)
 212                 return 0;
 213
 214         maxlen = 0;
 215         for (i = 0; i < new->max; i++) {
 216                 len = 0;
 217                 hlist_for_each_entry(mp, &new->mhash[i], hlist[new->ver])
 218                         len++;
 219                 if (len > maxlen)
 220                         maxlen = len;
 221         }
 222
 223         return maxlen > elasticity ? -EINVAL : 0;
 224 }
 225
 226 void br_multicast_free_pg(struct rcu_head *head)
 227 {
 228         struct net_bridge_port_group *p =
 229                 container_of(head, struct net_bridge_port_group, rcu);
 230
 231         kfree(p);
 232 }
 233
 234 static void br_multicast_free_group(struct rcu_head *head)
 235 {
 236         struct net_bridge_mdb_entry *mp =
 237                 container_of(head, struct net_bridge_mdb_entry, rcu);
 238
 239         kfree(mp);
 240 }
 241
 242 static void br_multicast_group_expired(struct timer_list *t)
 243 {
 244         struct net_bridge_mdb_entry *mp = from_timer(mp, t, timer);
 245         struct net_bridge *br = mp->br;
 246         struct net_bridge_mdb_htable *mdb;
 247
 248         spin_lock(&br->multicast_lock);
 249         if (!netif_running(br->dev) || timer_pending(&mp->timer))
 250                 goto out;
 251
 252         mp->host_joined = false;
 253         br_mdb_notify(br->dev, NULL, &mp->addr, RTM_DELMDB, 0);
 254
 255         if (mp->ports)
 256                 goto out;
 257
 258         mdb = mlock_dereference(br->mdb, br);
 259
 260         hlist_del_rcu(&mp->hlist[mdb->ver]);
 261         mdb->size--;
 262
 263         call_rcu_bh(&mp->rcu, br_multicast_free_group);
 264
 265 out:
 266         spin_unlock(&br->multicast_lock);
 267 }
 268
 269 static void br_multicast_del_pg(struct net_bridge *br,
 270                                 struct net_bridge_port_group *pg)
 271 {
 272         struct net_bridge_mdb_htable *mdb;
 273         struct net_bridge_mdb_entry *mp;
 274         struct net_bridge_port_group *p;
 275         struct net_bridge_port_group __rcu **pp;
 276
 277         mdb = mlock_dereference(br->mdb, br);
 278
 279         mp = br_mdb_ip_get(mdb, &pg->addr);
 280         if (WARN_ON(!mp))
 281                 return;
 282
 283         for (pp = &mp->ports;
 284              (p = mlock_dereference(*pp, br)) != NULL;
 285              pp = &p->next) {
 286                 if (p != pg)
 287                         continue;
 288
 289                 rcu_assign_pointer(*pp, p->next);
 290                 hlist_del_init(&p->mglist);
 291                 del_timer(&p->timer);
 292                 br_mdb_notify(br->dev, p->port, &pg->addr, RTM_DELMDB,
 293                               p->flags);
 294                 call_rcu_bh(&p->rcu, br_multicast_free_pg);
 295
 296                 if (!mp->ports && !mp->host_joined &&
 297                     netif_running(br->dev))
 298                         mod_timer(&mp->timer, jiffies);
 299
 300                 return;
 301         }
 302
 303         WARN_ON(1);
 304 }
 305
 306 static void br_multicast_port_group_expired(struct timer_list *t)
 307 {
 308         struct net_bridge_port_group *pg = from_timer(pg, t, timer);
 309         struct net_bridge *br = pg->port->br;
 310
 311         spin_lock(&br->multicast_lock);
 312         if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
 313             hlist_unhashed(&pg->mglist) || pg->flags & MDB_PG_FLAGS_PERMANENT)
 314                 goto out;
 315
 316         br_multicast_del_pg(br, pg);
 317
 318 out:
 319         spin_unlock(&br->multicast_lock);
 320 }
 321
 322 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
 323                          int elasticity)
 324 {
 325         struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
 326         struct net_bridge_mdb_htable *mdb;
 327         int err;
 328
 329         mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
 330         if (!mdb)
 331                 return -ENOMEM;
 332
 333         mdb->max = max;
 334         mdb->old = old;
 335
 336         mdb->mhash = kcalloc(max, sizeof(*mdb->mhash), GFP_ATOMIC);
 337         if (!mdb->mhash) {
 338                 kfree(mdb);
 339                 return -ENOMEM;
 340         }
 341
 342         mdb->size = old ? old->size : 0;
 343         mdb->ver = old ? old->ver ^ 1 : 0;
 344
 345         if (!old || elasticity)
 346                 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
 347         else
 348                 mdb->secret = old->secret;
 349
 350         if (!old)
 351                 goto out;
 352
 353         err = br_mdb_copy(mdb, old, elasticity);
 354         if (err) {
 355                 kfree(mdb->mhash);
 356                 kfree(mdb);
 357                 return err;
 358         }
 359
 360         br_mdb_rehash_seq++;
 361         call_rcu_bh(&mdb->rcu, br_mdb_free);
 362
 363 out:
 364         rcu_assign_pointer(*mdbp, mdb);
 365
 366         return 0;
 367 }
 368
 369 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
 370                                                     __be32 group,
 371                                                     u8 *igmp_type)
 372 {
 373         struct igmpv3_query *ihv3;
 374         size_t igmp_hdr_size;
 375         struct sk_buff *skb;
 376         struct igmphdr *ih;
 377         struct ethhdr *eth;
 378         struct iphdr *iph;
 379
 380         igmp_hdr_size = sizeof(*ih);
 381         if (br->multicast_igmp_version == 3)
 382                 igmp_hdr_size = sizeof(*ihv3);
 383         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
 384                                                  igmp_hdr_size + 4);
 385         if (!skb)
 386                 goto out;
 387
 388         skb->protocol = htons(ETH_P_IP);
 389
 390         skb_reset_mac_header(skb);
 391         eth = eth_hdr(skb);
 392
 393         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 394         eth->h_dest[0] = 1;
 395         eth->h_dest[1] = 0;
 396         eth->h_dest[2] = 0x5e;
 397         eth->h_dest[3] = 0;
 398         eth->h_dest[4] = 0;
 399         eth->h_dest[5] = 1;
 400         eth->h_proto = htons(ETH_P_IP);
 401         skb_put(skb, sizeof(*eth));
 402
 403         skb_set_network_header(skb, skb->len);
 404         iph = ip_hdr(skb);
 405
 406         iph->version = 4;
 407         iph->ihl = 6;
 408         iph->tos = 0xc0;
 409         iph->tot_len = htons(sizeof(*iph) + igmp_hdr_size + 4);
 410         iph->id = 0;
 411         iph->frag_off = htons(IP_DF);
 412         iph->ttl = 1;
 413         iph->protocol = IPPROTO_IGMP;
 414         iph->saddr = br->multicast_query_use_ifaddr ?
 415                      inet_select_addr(br->dev, 0, RT_SCOPE_LINK) : 0;
 416         iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
 417         ((u8 *)&iph[1])[0] = IPOPT_RA;
 418         ((u8 *)&iph[1])[1] = 4;
 419         ((u8 *)&iph[1])[2] = 0;
 420         ((u8 *)&iph[1])[3] = 0;
 421         ip_send_check(iph);
 422         skb_put(skb, 24);
 423
 424         skb_set_transport_header(skb, skb->len);
 425         *igmp_type = IGMP_HOST_MEMBERSHIP_QUERY;
 426
 427         switch (br->multicast_igmp_version) {
 428         case 2:
 429                 ih = igmp_hdr(skb);
 430                 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
 431                 ih->code = (group ? br->multicast_last_member_interval :
 432                                     br->multicast_query_response_interval) /
 433                            (HZ / IGMP_TIMER_SCALE);
 434                 ih->group = group;
 435                 ih->csum = 0;
 436                 ih->csum = ip_compute_csum((void *)ih, sizeof(*ih));
 437                 break;
 438         case 3:
 439                 ihv3 = igmpv3_query_hdr(skb);
 440                 ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY;
 441                 ihv3->code = (group ? br->multicast_last_member_interval :
 442                                       br->multicast_query_response_interval) /
 443                              (HZ / IGMP_TIMER_SCALE);
 444                 ihv3->group = group;
 445                 ihv3->qqic = br->multicast_query_interval / HZ;
 446                 ihv3->nsrcs = 0;
 447                 ihv3->resv = 0;
 448                 ihv3->suppress = 0;
 449                 ihv3->qrv = 2;
 450                 ihv3->csum = 0;
 451                 ihv3->csum = ip_compute_csum((void *)ihv3, sizeof(*ihv3));
 452                 break;
 453         }
 454
 455         skb_put(skb, igmp_hdr_size);
 456         __skb_pull(skb, sizeof(*eth));
 457
 458 out:
 459         return skb;
 460 }
 461
 462 #if IS_ENABLED(CONFIG_IPV6)
 463 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
 464                                                     const struct in6_addr *grp,
 465                                                     u8 *igmp_type)
 466 {
 467         struct mld2_query *mld2q;
 468         unsigned long interval;
 469         struct ipv6hdr *ip6h;
 470         struct mld_msg *mldq;
 471         size_t mld_hdr_size;
 472         struct sk_buff *skb;
 473         struct ethhdr *eth;
 474         u8 *hopopt;
 475
 476         mld_hdr_size = sizeof(*mldq);
 477         if (br->multicast_mld_version == 2)
 478                 mld_hdr_size = sizeof(*mld2q);
 479         skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
 480                                                  8 + mld_hdr_size);
 481         if (!skb)
 482                 goto out;
 483
 484         skb->protocol = htons(ETH_P_IPV6);
 485
 486         /* Ethernet header */
 487         skb_reset_mac_header(skb);
 488         eth = eth_hdr(skb);
 489
 490         ether_addr_copy(eth->h_source, br->dev->dev_addr);
 491         eth->h_proto = htons(ETH_P_IPV6);
 492         skb_put(skb, sizeof(*eth));
 493
 494         /* IPv6 header + HbH option */
 495         skb_set_network_header(skb, skb->len);
 496         ip6h = ipv6_hdr(skb);
 497
 498         *(__force __be32 *)ip6h = htonl(0x60000000);
 499         ip6h->payload_len = htons(8 + mld_hdr_size);
 500         ip6h->nexthdr = IPPROTO_HOPOPTS;
 501         ip6h->hop_limit = 1;
 502         ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
 503         if (ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
 504                                &ip6h->saddr)) {
 505                 kfree_skb(skb);
 506                 br->has_ipv6_addr = 0;
 507                 return NULL;
 508         }
 509
 510         br->has_ipv6_addr = 1;
 511         ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
 512
 513         hopopt = (u8 *)(ip6h + 1);
 514         hopopt[0] = IPPROTO_ICMPV6;             /* next hdr */
 515         hopopt[1] = 0;                          /* length of HbH */
 516         hopopt[2] = IPV6_TLV_ROUTERALERT;       /* Router Alert */
 517         hopopt[3] = 2;                          /* Length of RA Option */
 518         hopopt[4] = 0;                          /* Type = 0x0000 (MLD) */
 519         hopopt[5] = 0;
 520         hopopt[6] = IPV6_TLV_PAD1;              /* Pad1 */
 521         hopopt[7] = IPV6_TLV_PAD1;              /* Pad1 */
 522
 523         skb_put(skb, sizeof(*ip6h) + 8);
 524
 525         /* ICMPv6 */
 526         skb_set_transport_header(skb, skb->len);
 527         interval = ipv6_addr_any(grp) ?
 528                         br->multicast_query_response_interval :
 529                         br->multicast_last_member_interval;
 530         *igmp_type = ICMPV6_MGM_QUERY;
 531         switch (br->multicast_mld_version) {
 532         case 1:
 533                 mldq = (struct mld_msg *)icmp6_hdr(skb);
 534                 mldq->mld_type = ICMPV6_MGM_QUERY;
 535                 mldq->mld_code = 0;
 536                 mldq->mld_cksum = 0;
 537                 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
 538                 mldq->mld_reserved = 0;
 539                 mldq->mld_mca = *grp;
 540                 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 541                                                   sizeof(*mldq), IPPROTO_ICMPV6,
 542                                                   csum_partial(mldq,
 543                                                                sizeof(*mldq),
 544                                                                0));
 545                 break;
 546         case 2:
 547                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
 548                 mld2q->mld2q_mrc = htons((u16)jiffies_to_msecs(interval));
 549                 mld2q->mld2q_type = ICMPV6_MGM_QUERY;
 550                 mld2q->mld2q_code = 0;
 551                 mld2q->mld2q_cksum = 0;
 552                 mld2q->mld2q_resv1 = 0;
 553                 mld2q->mld2q_resv2 = 0;
 554                 mld2q->mld2q_suppress = 0;
 555                 mld2q->mld2q_qrv = 2;
 556                 mld2q->mld2q_nsrcs = 0;
 557                 mld2q->mld2q_qqic = br->multicast_query_interval / HZ;
 558                 mld2q->mld2q_mca = *grp;
 559                 mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
 560                                                      sizeof(*mld2q),
 561                                                      IPPROTO_ICMPV6,
 562                                                      csum_partial(mld2q,
 563                                                                   sizeof(*mld2q),
 564                                                                   0));
 565                 break;
 566         }
 567         skb_put(skb, mld_hdr_size);
 568
 569         __skb_pull(skb, sizeof(*eth));
 570
 571 out:
 572         return skb;
 573 }
 574 #endif
 575
 576 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
 577                                                 struct br_ip *addr,
 578                                                 u8 *igmp_type)
 579 {
 580         switch (addr->proto) {
 581         case htons(ETH_P_IP):
 582                 return br_ip4_multicast_alloc_query(br, addr->u.ip4, igmp_type);
 583 #if IS_ENABLED(CONFIG_IPV6)
 584         case htons(ETH_P_IPV6):
 585                 return br_ip6_multicast_alloc_query(br, &addr->u.ip6,
 586                                                     igmp_type);
 587 #endif
 588         }
 589         return NULL;
 590 }
 591
 592 static struct net_bridge_mdb_entry *br_multicast_get_group(
 593         struct net_bridge *br, struct net_bridge_port *port,
 594         struct br_ip *group, int hash)
 595 {
 596         struct net_bridge_mdb_htable *mdb;
 597         struct net_bridge_mdb_entry *mp;
 598         unsigned int count = 0;
 599         unsigned int max;
 600         int elasticity;
 601         int err;
 602
 603         mdb = rcu_dereference_protected(br->mdb, 1);
 604         hlist_for_each_entry(mp, &mdb->mhash[hash], hlist[mdb->ver]) {
 605                 count++;
 606                 if (unlikely(br_ip_equal(group, &mp->addr)))
 607                         return mp;
 608         }
 609
 610         elasticity = 0;
 611         max = mdb->max;
 612
 613         if (unlikely(count > br->hash_elasticity && count)) {
 614                 if (net_ratelimit())
 615                         br_info(br, "Multicast hash table "
 616                                 "chain limit reached: %s\n",
 617                                 port ? port->dev->name : br->dev->name);
 618
 619                 elasticity = br->hash_elasticity;
 620         }
 621
 622         if (mdb->size >= max) {
 623                 max *= 2;
 624                 if (unlikely(max > br->hash_max)) {
 625                         br_warn(br, "Multicast hash table maximum of %d "
 626                                 "reached, disabling snooping: %s\n",
 627                                 br->hash_max,
 628                                 port ? port->dev->name : br->dev->name);
 629                         err = -E2BIG;
 630 disable:
 631                         br->multicast_disabled = 1;
 632                         goto err;
 633                 }
 634         }
 635
 636         if (max > mdb->max || elasticity) {
 637                 if (mdb->old) {
 638                         if (net_ratelimit())
 639                                 br_info(br, "Multicast hash table "
 640                                         "on fire: %s\n",
 641                                         port ? port->dev->name : br->dev->name);
 642                         err = -EEXIST;
 643                         goto err;
 644                 }
 645
 646                 err = br_mdb_rehash(&br->mdb, max, elasticity);
 647                 if (err) {
 648                         br_warn(br, "Cannot rehash multicast "
 649                                 "hash table, disabling snooping: %s, %d, %d\n",
 650                                 port ? port->dev->name : br->dev->name,
 651                                 mdb->size, err);
 652                         goto disable;
 653                 }
 654
 655                 err = -EAGAIN;
 656                 goto err;
 657         }
 658
 659         return NULL;
 660
 661 err:
 662         mp = ERR_PTR(err);
 663         return mp;
 664 }
 665
 666 struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
 667                                                     struct net_bridge_port *p,
 668                                                     struct br_ip *group)
 669 {
 670         struct net_bridge_mdb_htable *mdb;
 671         struct net_bridge_mdb_entry *mp;
 672         int hash;
 673         int err;
 674
 675         mdb = rcu_dereference_protected(br->mdb, 1);
 676         if (!mdb) {
 677                 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
 678                 if (err)
 679                         return ERR_PTR(err);
 680                 goto rehash;
 681         }
 682
 683         hash = br_ip_hash(mdb, group);
 684         mp = br_multicast_get_group(br, p, group, hash);
 685         switch (PTR_ERR(mp)) {
 686         case 0:
 687                 break;
 688
 689         case -EAGAIN:
 690 rehash:
 691                 mdb = rcu_dereference_protected(br->mdb, 1);
 692                 hash = br_ip_hash(mdb, group);
 693                 break;
 694
 695         default:
 696                 goto out;
 697         }
 698
 699         mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
 700         if (unlikely(!mp))
 701                 return ERR_PTR(-ENOMEM);
 702
 703         mp->br = br;
 704         mp->addr = *group;
 705         timer_setup(&mp->timer, br_multicast_group_expired, 0);
 706
 707         hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
 708         mdb->size++;
 709
 710 out:
 711         return mp;
 712 }
 713
 714 struct net_bridge_port_group *br_multicast_new_port_group(
 715                         struct net_bridge_port *port,
 716                         struct br_ip *group,
 717                         struct net_bridge_port_group __rcu *next,
 718                         unsigned char flags,
 719                         const unsigned char *src)
 720 {
 721         struct net_bridge_port_group *p;
 722
 723         p = kzalloc(sizeof(*p), GFP_ATOMIC);
 724         if (unlikely(!p))
 725                 return NULL;
 726
 727         p->addr = *group;
 728         p->port = port;
 729         p->flags = flags;
 730         rcu_assign_pointer(p->next, next);
 731         hlist_add_head(&p->mglist, &port->mglist);
 732         timer_setup(&p->timer, br_multicast_port_group_expired, 0);
 733
 734         if (src)
 735                 memcpy(p->eth_addr, src, ETH_ALEN);
 736         else
 737                 memset(p->eth_addr, 0xff, ETH_ALEN);
 738
 739         return p;
 740 }
 741
 742 static bool br_port_group_equal(struct net_bridge_port_group *p,
 743                                 struct net_bridge_port *port,
 744                                 const unsigned char *src)
 745 {
 746         if (p->port != port)
 747                 return false;
 748
 749         if (!(port->flags & BR_MULTICAST_TO_UNICAST))
 750                 return true;
 751
 752         return ether_addr_equal(src, p->eth_addr);
 753 }
 754
 755 static int br_multicast_add_group(struct net_bridge *br,
 756                                   struct net_bridge_port *port,
 757                                   struct br_ip *group,
 758                                   const unsigned char *src)
 759 {
 760         struct net_bridge_port_group __rcu **pp;
 761         struct net_bridge_port_group *p;
 762         struct net_bridge_mdb_entry *mp;
 763         unsigned long now = jiffies;
 764         int err;
 765
 766         spin_lock(&br->multicast_lock);
 767         if (!netif_running(br->dev) ||
 768             (port && port->state == BR_STATE_DISABLED))
 769                 goto out;
 770
 771         mp = br_multicast_new_group(br, port, group);
 772         err = PTR_ERR(mp);
 773         if (IS_ERR(mp))
 774                 goto err;
 775
 776         if (!port) {
 777                 if (!mp->host_joined) {
 778                         mp->host_joined = true;
 779                         br_mdb_notify(br->dev, NULL, &mp->addr, RTM_NEWMDB, 0);
 780                 }
 781                 mod_timer(&mp->timer, now + br->multicast_membership_interval);
 782                 goto out;
 783         }
 784
 785         for (pp = &mp->ports;
 786              (p = mlock_dereference(*pp, br)) != NULL;
 787              pp = &p->next) {
 788                 if (br_port_group_equal(p, port, src))
 789                         goto found;
 790                 if ((unsigned long)p->port < (unsigned long)port)
 791                         break;
 792         }
 793
 794         p = br_multicast_new_port_group(port, group, *pp, 0, src);
 795         if (unlikely(!p))
 796                 goto err;
 797         rcu_assign_pointer(*pp, p);
 798         br_mdb_notify(br->dev, port, group, RTM_NEWMDB, 0);
 799
 800 found:
 801         mod_timer(&p->timer, now + br->multicast_membership_interval);
 802 out:
 803         err = 0;
 804
 805 err:
 806         spin_unlock(&br->multicast_lock);
 807         return err;
 808 }
 809
 810 static int br_ip4_multicast_add_group(struct net_bridge *br,
 811                                       struct net_bridge_port *port,
 812                                       __be32 group,
 813                                       __u16 vid,
 814                                       const unsigned char *src)
 815 {
 816         struct br_ip br_group;
 817
 818         if (ipv4_is_local_multicast(group))
 819                 return 0;
 820
 821         br_group.u.ip4 = group;
 822         br_group.proto = htons(ETH_P_IP);
 823         br_group.vid = vid;
 824
 825         return br_multicast_add_group(br, port, &br_group, src);
 826 }
 827
 828 #if IS_ENABLED(CONFIG_IPV6)
 829 static int br_ip6_multicast_add_group(struct net_bridge *br,
 830                                       struct net_bridge_port *port,
 831                                       const struct in6_addr *group,
 832                                       __u16 vid,
 833                                       const unsigned char *src)
 834 {
 835         struct br_ip br_group;
 836
 837         if (ipv6_addr_is_ll_all_nodes(group))
 838                 return 0;
 839
 840         br_group.u.ip6 = *group;
 841         br_group.proto = htons(ETH_P_IPV6);
 842         br_group.vid = vid;
 843
 844         return br_multicast_add_group(br, port, &br_group, src);
 845 }
 846 #endif
 847
 848 static void br_multicast_router_expired(struct timer_list *t)
 849 {
 850         struct net_bridge_port *port =
 851                         from_timer(port, t, multicast_router_timer);
 852         struct net_bridge *br = port->br;
 853
 854         spin_lock(&br->multicast_lock);
 855         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
 856             port->multicast_router == MDB_RTR_TYPE_PERM ||
 857             timer_pending(&port->multicast_router_timer))
 858                 goto out;
 859
 860         __del_port_router(port);
 861 out:
 862         spin_unlock(&br->multicast_lock);
 863 }
 864
 865 static void br_mc_router_state_change(struct net_bridge *p,
 866                                       bool is_mc_router)
 867 {
 868         struct switchdev_attr attr = {
 869                 .orig_dev = p->dev,
 870                 .id = SWITCHDEV_ATTR_ID_BRIDGE_MROUTER,
 871                 .flags = SWITCHDEV_F_DEFER,
 872                 .u.mrouter = is_mc_router,
 873         };
 874
 875         switchdev_port_attr_set(p->dev, &attr);
 876 }
 877
 878 static void br_multicast_local_router_expired(struct timer_list *t)
 879 {
 880         struct net_bridge *br = from_timer(br, t, multicast_router_timer);
 881
 882         spin_lock(&br->multicast_lock);
 883         if (br->multicast_router == MDB_RTR_TYPE_DISABLED ||
 884             br->multicast_router == MDB_RTR_TYPE_PERM ||
 885             timer_pending(&br->multicast_router_timer))
 886                 goto out;
 887
 888         br_mc_router_state_change(br, false);
 889 out:
 890         spin_unlock(&br->multicast_lock);
 891 }
 892
 893 static void br_multicast_querier_expired(struct net_bridge *br,
 894                                          struct bridge_mcast_own_query *query)
 895 {
 896         spin_lock(&br->multicast_lock);
 897         if (!netif_running(br->dev) || br->multicast_disabled)
 898                 goto out;
 899
 900         br_multicast_start_querier(br, query);
 901
 902 out:
 903         spin_unlock(&br->multicast_lock);
 904 }
 905
 906 static void br_ip4_multicast_querier_expired(struct timer_list *t)
 907 {
 908         struct net_bridge *br = from_timer(br, t, ip4_other_query.timer);
 909
 910         br_multicast_querier_expired(br, &br->ip4_own_query);
 911 }
 912
 913 #if IS_ENABLED(CONFIG_IPV6)
 914 static void br_ip6_multicast_querier_expired(struct timer_list *t)
 915 {
 916         struct net_bridge *br = from_timer(br, t, ip6_other_query.timer);
 917
 918         br_multicast_querier_expired(br, &br->ip6_own_query);
 919 }
 920 #endif
 921
 922 static void br_multicast_select_own_querier(struct net_bridge *br,
 923                                             struct br_ip *ip,
 924                                             struct sk_buff *skb)
 925 {
 926         if (ip->proto == htons(ETH_P_IP))
 927                 br->ip4_querier.addr.u.ip4 = ip_hdr(skb)->saddr;
 928 #if IS_ENABLED(CONFIG_IPV6)
 929         else
 930                 br->ip6_querier.addr.u.ip6 = ipv6_hdr(skb)->saddr;
 931 #endif
 932 }
 933
 934 static void __br_multicast_send_query(struct net_bridge *br,
 935                                       struct net_bridge_port *port,
 936                                       struct br_ip *ip)
 937 {
 938         struct sk_buff *skb;
 939         u8 igmp_type;
 940
 941         skb = br_multicast_alloc_query(br, ip, &igmp_type);
 942         if (!skb)
 943                 return;
 944
 945         if (port) {
 946                 skb->dev = port->dev;
 947                 br_multicast_count(br, port, skb, igmp_type,
 948                                    BR_MCAST_DIR_TX);
 949                 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT,
 950                         dev_net(port->dev), NULL, skb, NULL, skb->dev,
 951                         br_dev_queue_push_xmit);
 952         } else {
 953                 br_multicast_select_own_querier(br, ip, skb);
 954                 br_multicast_count(br, port, skb, igmp_type,
 955                                    BR_MCAST_DIR_RX);
 956                 netif_rx(skb);
 957         }
 958 }
 959
 960 static void br_multicast_send_query(struct net_bridge *br,
 961                                     struct net_bridge_port *port,
 962                                     struct bridge_mcast_own_query *own_query)
 963 {
 964         struct bridge_mcast_other_query *other_query = NULL;
 965         struct br_ip br_group;
 966         unsigned long time;
 967
 968         if (!netif_running(br->dev) || br->multicast_disabled ||
 969             !br->multicast_querier)
 970                 return;
 971
 972         memset(&br_group.u, 0, sizeof(br_group.u));
 973
 974         if (port ? (own_query == &port->ip4_own_query) :
 975                    (own_query == &br->ip4_own_query)) {
 976                 other_query = &br->ip4_other_query;
 977                 br_group.proto = htons(ETH_P_IP);
 978 #if IS_ENABLED(CONFIG_IPV6)
 979         } else {
 980                 other_query = &br->ip6_other_query;
 981                 br_group.proto = htons(ETH_P_IPV6);
 982 #endif
 983         }
 984
 985         if (!other_query || timer_pending(&other_query->timer))
 986                 return;
 987
 988         __br_multicast_send_query(br, port, &br_group);
 989
 990         time = jiffies;
 991         time += own_query->startup_sent < br->multicast_startup_query_count ?
 992                 br->multicast_startup_query_interval :
 993                 br->multicast_query_interval;
 994         mod_timer(&own_query->timer, time);
 995 }
 996
 997 static void
 998 br_multicast_port_query_expired(struct net_bridge_port *port,
 999                                 struct bridge_mcast_own_query *query)
1000 {
1001         struct net_bridge *br = port->br;
1002
1003         spin_lock(&br->multicast_lock);
1004         if (port->state == BR_STATE_DISABLED ||
1005             port->state == BR_STATE_BLOCKING)
1006                 goto out;
1007
1008         if (query->startup_sent < br->multicast_startup_query_count)
1009                 query->startup_sent++;
1010
1011         br_multicast_send_query(port->br, port, query);
1012
1013 out:
1014         spin_unlock(&br->multicast_lock);
1015 }
1016
1017 static void br_ip4_multicast_port_query_expired(struct timer_list *t)
1018 {
1019         struct net_bridge_port *port = from_timer(port, t, ip4_own_query.timer);
1020
1021         br_multicast_port_query_expired(port, &port->ip4_own_query);
1022 }
1023
1024 #if IS_ENABLED(CONFIG_IPV6)
1025 static void br_ip6_multicast_port_query_expired(struct timer_list *t)
1026 {
1027         struct net_bridge_port *port = from_timer(port, t, ip6_own_query.timer);
1028
1029         br_multicast_port_query_expired(port, &port->ip6_own_query);
1030 }
1031 #endif
1032
1033 static void br_mc_disabled_update(struct net_device *dev, bool value)
1034 {
1035         struct switchdev_attr attr = {
1036                 .orig_dev = dev,
1037                 .id = SWITCHDEV_ATTR_ID_BRIDGE_MC_DISABLED,
1038                 .flags = SWITCHDEV_F_DEFER,
1039                 .u.mc_disabled = value,
1040         };
1041
1042         switchdev_port_attr_set(dev, &attr);
1043 }
1044
1045 int br_multicast_add_port(struct net_bridge_port *port)
1046 {
1047         port->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1048
1049         timer_setup(&port->multicast_router_timer,
1050                     br_multicast_router_expired, 0);
1051         timer_setup(&port->ip4_own_query.timer,
1052                     br_ip4_multicast_port_query_expired, 0);
1053 #if IS_ENABLED(CONFIG_IPV6)
1054         timer_setup(&port->ip6_own_query.timer,
1055                     br_ip6_multicast_port_query_expired, 0);
1056 #endif
1057         br_mc_disabled_update(port->dev, port->br->multicast_disabled);
1058
1059         port->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
1060         if (!port->mcast_stats)
1061                 return -ENOMEM;
1062
1063         return 0;
1064 }
1065
1066 void br_multicast_del_port(struct net_bridge_port *port)
1067 {
1068         struct net_bridge *br = port->br;
1069         struct net_bridge_port_group *pg;
1070         struct hlist_node *n;
1071
1072         /* Take care of the remaining groups, only perm ones should be left */
1073         spin_lock_bh(&br->multicast_lock);
1074         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1075                 br_multicast_del_pg(br, pg);
1076         spin_unlock_bh(&br->multicast_lock);
1077         del_timer_sync(&port->multicast_router_timer);
1078         free_percpu(port->mcast_stats);
1079 }
1080
1081 static void br_multicast_enable(struct bridge_mcast_own_query *query)
1082 {
1083         query->startup_sent = 0;
1084
1085         if (try_to_del_timer_sync(&query->timer) >= 0 ||
1086             del_timer(&query->timer))
1087                 mod_timer(&query->timer, jiffies);
1088 }
1089
1090 static void __br_multicast_enable_port(struct net_bridge_port *port)
1091 {
1092         struct net_bridge *br = port->br;
1093
1094         if (br->multicast_disabled || !netif_running(br->dev))
1095                 return;
1096
1097         br_multicast_enable(&port->ip4_own_query);
1098 #if IS_ENABLED(CONFIG_IPV6)
1099         br_multicast_enable(&port->ip6_own_query);
1100 #endif
1101         if (port->multicast_router == MDB_RTR_TYPE_PERM &&
1102             hlist_unhashed(&port->rlist))
1103                 br_multicast_add_router(br, port);
1104 }
1105
1106 void br_multicast_enable_port(struct net_bridge_port *port)
1107 {
1108         struct net_bridge *br = port->br;
1109
1110         spin_lock(&br->multicast_lock);
1111         __br_multicast_enable_port(port);
1112         spin_unlock(&br->multicast_lock);
1113 }
1114
1115 void br_multicast_disable_port(struct net_bridge_port *port)
1116 {
1117         struct net_bridge *br = port->br;
1118         struct net_bridge_port_group *pg;
1119         struct hlist_node *n;
1120
1121         spin_lock(&br->multicast_lock);
1122         hlist_for_each_entry_safe(pg, n, &port->mglist, mglist)
1123                 if (!(pg->flags & MDB_PG_FLAGS_PERMANENT))
1124                         br_multicast_del_pg(br, pg);
1125
1126         __del_port_router(port);
1127
1128         del_timer(&port->multicast_router_timer);
1129         del_timer(&port->ip4_own_query.timer);
1130 #if IS_ENABLED(CONFIG_IPV6)
1131         del_timer(&port->ip6_own_query.timer);
1132 #endif
1133         spin_unlock(&br->multicast_lock);
1134 }
1135
1136 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
1137                                          struct net_bridge_port *port,
1138                                          struct sk_buff *skb,
1139                                          u16 vid)
1140 {
1141         const unsigned char *src;
1142         struct igmpv3_report *ih;
1143         struct igmpv3_grec *grec;
1144         int i;
1145         int len;
1146         int num;
1147         int type;
1148         int err = 0;
1149         __be32 group;
1150
1151         ih = igmpv3_report_hdr(skb);
1152         num = ntohs(ih->ngrec);
1153         len = skb_transport_offset(skb) + sizeof(*ih);
1154
1155         for (i = 0; i < num; i++) {
1156                 len += sizeof(*grec);
1157                 if (!pskb_may_pull(skb, len))
1158                         return -EINVAL;
1159
1160                 grec = (void *)(skb->data + len - sizeof(*grec));
1161                 group = grec->grec_mca;
1162                 type = grec->grec_type;
1163
1164                 len += ntohs(grec->grec_nsrcs) * 4;
1165                 if (!pskb_may_pull(skb, len))
1166                         return -EINVAL;
1167
1168                 /* We treat this as an IGMPv2 report for now. */
1169                 switch (type) {
1170                 case IGMPV3_MODE_IS_INCLUDE:
1171                 case IGMPV3_MODE_IS_EXCLUDE:
1172                 case IGMPV3_CHANGE_TO_INCLUDE:
1173                 case IGMPV3_CHANGE_TO_EXCLUDE:
1174                 case IGMPV3_ALLOW_NEW_SOURCES:
1175                 case IGMPV3_BLOCK_OLD_SOURCES:
1176                         break;
1177
1178                 default:
1179                         continue;
1180                 }
1181
1182                 src = eth_hdr(skb)->h_source;
1183                 if ((type == IGMPV3_CHANGE_TO_INCLUDE ||
1184                      type == IGMPV3_MODE_IS_INCLUDE) &&
1185                     ntohs(grec->grec_nsrcs) == 0) {
1186                         br_ip4_multicast_leave_group(br, port, group, vid, src);
1187                 } else {
1188                         err = br_ip4_multicast_add_group(br, port, group, vid,
1189                                                          src);
1190                         if (err)
1191                                 break;
1192                 }
1193         }
1194
1195         return err;
1196 }
1197
1198 #if IS_ENABLED(CONFIG_IPV6)
1199 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
1200                                         struct net_bridge_port *port,
1201                                         struct sk_buff *skb,
1202                                         u16 vid)
1203 {
1204         const unsigned char *src;
1205         struct icmp6hdr *icmp6h;
1206         struct mld2_grec *grec;
1207         int i;
1208         int len;
1209         int num;
1210         int err = 0;
1211
1212         if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1213                 return -EINVAL;
1214
1215         icmp6h = icmp6_hdr(skb);
1216         num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1217         len = skb_transport_offset(skb) + sizeof(*icmp6h);
1218
1219         for (i = 0; i < num; i++) {
1220                 __be16 *nsrcs, _nsrcs;
1221
1222                 nsrcs = skb_header_pointer(skb,
1223                                            len + offsetof(struct mld2_grec,
1224                                                           grec_nsrcs),
1225                                            sizeof(_nsrcs), &_nsrcs);
1226                 if (!nsrcs)
1227                         return -EINVAL;
1228
1229                 if (!pskb_may_pull(skb,
1230                                    len + sizeof(*grec) +
1231                                    sizeof(struct in6_addr) * ntohs(*nsrcs)))
1232                         return -EINVAL;
1233
1234                 grec = (struct mld2_grec *)(skb->data + len);
1235                 len += sizeof(*grec) +
1236                        sizeof(struct in6_addr) * ntohs(*nsrcs);
1237
1238                 /* We treat these as MLDv1 reports for now. */
1239                 switch (grec->grec_type) {
1240                 case MLD2_MODE_IS_INCLUDE:
1241                 case MLD2_MODE_IS_EXCLUDE:
1242                 case MLD2_CHANGE_TO_INCLUDE:
1243                 case MLD2_CHANGE_TO_EXCLUDE:
1244                 case MLD2_ALLOW_NEW_SOURCES:
1245                 case MLD2_BLOCK_OLD_SOURCES:
1246                         break;
1247
1248                 default:
1249                         continue;
1250                 }
1251
1252                 src = eth_hdr(skb)->h_source;
1253                 if ((grec->grec_type == MLD2_CHANGE_TO_INCLUDE ||
1254                      grec->grec_type == MLD2_MODE_IS_INCLUDE) &&
1255                     ntohs(*nsrcs) == 0) {
1256                         br_ip6_multicast_leave_group(br, port, &grec->grec_mca,
1257                                                      vid, src);
1258                 } else {
1259                         err = br_ip6_multicast_add_group(br, port,
1260                                                          &grec->grec_mca, vid,
1261                                                          src);
1262                         if (err)
1263                                 break;
1264                 }
1265         }
1266
1267         return err;
1268 }
1269 #endif
1270
1271 static bool br_ip4_multicast_select_querier(struct net_bridge *br,
1272                                             struct net_bridge_port *port,
1273                                             __be32 saddr)
1274 {
1275         if (!timer_pending(&br->ip4_own_query.timer) &&
1276             !timer_pending(&br->ip4_other_query.timer))
1277                 goto update;
1278
1279         if (!br->ip4_querier.addr.u.ip4)
1280                 goto update;
1281
1282         if (ntohl(saddr) <= ntohl(br->ip4_querier.addr.u.ip4))
1283                 goto update;
1284
1285         return false;
1286
1287 update:
1288         br->ip4_querier.addr.u.ip4 = saddr;
1289
1290         /* update protected by general multicast_lock by caller */
1291         rcu_assign_pointer(br->ip4_querier.port, port);
1292
1293         return true;
1294 }
1295
1296 #if IS_ENABLED(CONFIG_IPV6)
1297 static bool br_ip6_multicast_select_querier(struct net_bridge *br,
1298                                             struct net_bridge_port *port,
1299                                             struct in6_addr *saddr)
1300 {
1301         if (!timer_pending(&br->ip6_own_query.timer) &&
1302             !timer_pending(&br->ip6_other_query.timer))
1303                 goto update;
1304
1305         if (ipv6_addr_cmp(saddr, &br->ip6_querier.addr.u.ip6) <= 0)
1306                 goto update;
1307
1308         return false;
1309
1310 update:
1311         br->ip6_querier.addr.u.ip6 = *saddr;
1312
1313         /* update protected by general multicast_lock by caller */
1314         rcu_assign_pointer(br->ip6_querier.port, port);
1315
1316         return true;
1317 }
1318 #endif
1319
1320 static bool br_multicast_select_querier(struct net_bridge *br,
1321                                         struct net_bridge_port *port,
1322                                         struct br_ip *saddr)
1323 {
1324         switch (saddr->proto) {
1325         case htons(ETH_P_IP):
1326                 return br_ip4_multicast_select_querier(br, port, saddr->u.ip4);
1327 #if IS_ENABLED(CONFIG_IPV6)
1328         case htons(ETH_P_IPV6):
1329                 return br_ip6_multicast_select_querier(br, port, &saddr->u.ip6);
1330 #endif
1331         }
1332
1333         return false;
1334 }
1335
1336 static void
1337 br_multicast_update_query_timer(struct net_bridge *br,
1338                                 struct bridge_mcast_other_query *query,
1339                                 unsigned long max_delay)
1340 {
1341         if (!timer_pending(&query->timer))
1342                 query->delay_time = jiffies + max_delay;
1343
1344         mod_timer(&query->timer, jiffies + br->multicast_querier_interval);
1345 }
1346
1347 static void br_port_mc_router_state_change(struct net_bridge_port *p,
1348                                            bool is_mc_router)
1349 {
1350         struct switchdev_attr attr = {
1351                 .orig_dev = p->dev,
1352                 .id = SWITCHDEV_ATTR_ID_PORT_MROUTER,
1353                 .flags = SWITCHDEV_F_DEFER,
1354                 .u.mrouter = is_mc_router,
1355         };
1356
1357         switchdev_port_attr_set(p->dev, &attr);
1358 }
1359
1360 /*
1361  * Add port to router_list
1362  *  list is maintained ordered by pointer value
1363  *  and locked by br->multicast_lock and RCU
1364  */
1365 static void br_multicast_add_router(struct net_bridge *br,
1366                                     struct net_bridge_port *port)
1367 {
1368         struct net_bridge_port *p;
1369         struct hlist_node *slot = NULL;
1370
1371         if (!hlist_unhashed(&port->rlist))
1372                 return;
1373
1374         hlist_for_each_entry(p, &br->router_list, rlist) {
1375                 if ((unsigned long) port >= (unsigned long) p)
1376                         break;
1377                 slot = &p->rlist;
1378         }
1379
1380         if (slot)
1381                 hlist_add_behind_rcu(&port->rlist, slot);
1382         else
1383                 hlist_add_head_rcu(&port->rlist, &br->router_list);
1384         br_rtr_notify(br->dev, port, RTM_NEWMDB);
1385         br_port_mc_router_state_change(port, true);
1386 }
1387
1388 static void br_multicast_mark_router(struct net_bridge *br,
1389                                      struct net_bridge_port *port)
1390 {
1391         unsigned long now = jiffies;
1392
1393         if (!port) {
1394                 if (br->multicast_router == MDB_RTR_TYPE_TEMP_QUERY) {
1395                         if (!timer_pending(&br->multicast_router_timer))
1396                                 br_mc_router_state_change(br, true);
1397                         mod_timer(&br->multicast_router_timer,
1398                                   now + br->multicast_querier_interval);
1399                 }
1400                 return;
1401         }
1402
1403         if (port->multicast_router == MDB_RTR_TYPE_DISABLED ||
1404             port->multicast_router == MDB_RTR_TYPE_PERM)
1405                 return;
1406
1407         br_multicast_add_router(br, port);
1408
1409         mod_timer(&port->multicast_router_timer,
1410                   now + br->multicast_querier_interval);
1411 }
1412
1413 static void br_multicast_query_received(struct net_bridge *br,
1414                                         struct net_bridge_port *port,
1415                                         struct bridge_mcast_other_query *query,
1416                                         struct br_ip *saddr,
1417                                         unsigned long max_delay)
1418 {
1419         if (!br_multicast_select_querier(br, port, saddr))
1420                 return;
1421
1422         br_multicast_update_query_timer(br, query, max_delay);
1423         br_multicast_mark_router(br, port);
1424 }
1425
1426 static void br_ip4_multicast_query(struct net_bridge *br,
1427                                    struct net_bridge_port *port,
1428                                    struct sk_buff *skb,
1429                                    u16 vid)
1430 {
1431         const struct iphdr *iph = ip_hdr(skb);
1432         struct igmphdr *ih = igmp_hdr(skb);
1433         struct net_bridge_mdb_entry *mp;
1434         struct igmpv3_query *ih3;
1435         struct net_bridge_port_group *p;
1436         struct net_bridge_port_group __rcu **pp;
1437         struct br_ip saddr;
1438         unsigned long max_delay;
1439         unsigned long now = jiffies;
1440         unsigned int offset = skb_transport_offset(skb);
1441         __be32 group;
1442
1443         spin_lock(&br->multicast_lock);
1444         if (!netif_running(br->dev) ||
1445             (port && port->state == BR_STATE_DISABLED))
1446                 goto out;
1447
1448         group = ih->group;
1449
1450         if (skb->len == offset + sizeof(*ih)) {
1451                 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1452
1453                 if (!max_delay) {
1454                         max_delay = 10 * HZ;
1455                         group = 0;
1456                 }
1457         } else if (skb->len >= offset + sizeof(*ih3)) {
1458                 ih3 = igmpv3_query_hdr(skb);
1459                 if (ih3->nsrcs)
1460                         goto out;
1461
1462                 max_delay = ih3->code ?
1463                             IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1464         } else {
1465                 goto out;
1466         }
1467
1468         if (!group) {
1469                 saddr.proto = htons(ETH_P_IP);
1470                 saddr.u.ip4 = iph->saddr;
1471
1472                 br_multicast_query_received(br, port, &br->ip4_other_query,
1473                                             &saddr, max_delay);
1474                 goto out;
1475         }
1476
1477         mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group, vid);
1478         if (!mp)
1479                 goto out;
1480
1481         max_delay *= br->multicast_last_member_count;
1482
1483         if (mp->host_joined &&
1484             (timer_pending(&mp->timer) ?
1485              time_after(mp->timer.expires, now + max_delay) :
1486              try_to_del_timer_sync(&mp->timer) >= 0))
1487                 mod_timer(&mp->timer, now + max_delay);
1488
1489         for (pp = &mp->ports;
1490              (p = mlock_dereference(*pp, br)) != NULL;
1491              pp = &p->next) {
1492                 if (timer_pending(&p->timer) ?
1493                     time_after(p->timer.expires, now + max_delay) :
1494                     try_to_del_timer_sync(&p->timer) >= 0)
1495                         mod_timer(&p->timer, now + max_delay);
1496         }
1497
1498 out:
1499         spin_unlock(&br->multicast_lock);
1500 }
1501
1502 #if IS_ENABLED(CONFIG_IPV6)
1503 static int br_ip6_multicast_query(struct net_bridge *br,
1504                                   struct net_bridge_port *port,
1505                                   struct sk_buff *skb,
1506                                   u16 vid)
1507 {
1508         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
1509         struct mld_msg *mld;
1510         struct net_bridge_mdb_entry *mp;
1511         struct mld2_query *mld2q;
1512         struct net_bridge_port_group *p;
1513         struct net_bridge_port_group __rcu **pp;
1514         struct br_ip saddr;
1515         unsigned long max_delay;
1516         unsigned long now = jiffies;
1517         unsigned int offset = skb_transport_offset(skb);
1518         const struct in6_addr *group = NULL;
1519         bool is_general_query;
1520         int err = 0;
1521
1522         spin_lock(&br->multicast_lock);
1523         if (!netif_running(br->dev) ||
1524             (port && port->state == BR_STATE_DISABLED))
1525                 goto out;
1526
1527         if (skb->len == offset + sizeof(*mld)) {
1528                 if (!pskb_may_pull(skb, offset + sizeof(*mld))) {
1529                         err = -EINVAL;
1530                         goto out;
1531                 }
1532                 mld = (struct mld_msg *) icmp6_hdr(skb);
1533                 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1534                 if (max_delay)
1535                         group = &mld->mld_mca;
1536         } else {
1537                 if (!pskb_may_pull(skb, offset + sizeof(*mld2q))) {
1538                         err = -EINVAL;
1539                         goto out;
1540                 }
1541                 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1542                 if (!mld2q->mld2q_nsrcs)
1543                         group = &mld2q->mld2q_mca;
1544
1545                 max_delay = max(msecs_to_jiffies(mldv2_mrc(mld2q)), 1UL);
1546         }
1547
1548         is_general_query = group && ipv6_addr_any(group);
1549
1550         if (is_general_query) {
1551                 saddr.proto = htons(ETH_P_IPV6);
1552                 saddr.u.ip6 = ip6h->saddr;
1553
1554                 br_multicast_query_received(br, port, &br->ip6_other_query,
1555                                             &saddr, max_delay);
1556                 goto out;
1557         } else if (!group) {
1558                 goto out;
1559         }
1560
1561         mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group, vid);
1562         if (!mp)
1563                 goto out;
1564
1565         max_delay *= br->multicast_last_member_count;
1566         if (mp->host_joined &&
1567             (timer_pending(&mp->timer) ?
1568              time_after(mp->timer.expires, now + max_delay) :
1569              try_to_del_timer_sync(&mp->timer) >= 0))
1570                 mod_timer(&mp->timer, now + max_delay);
1571
1572         for (pp = &mp->ports;
1573              (p = mlock_dereference(*pp, br)) != NULL;
1574              pp = &p->next) {
1575                 if (timer_pending(&p->timer) ?
1576                     time_after(p->timer.expires, now + max_delay) :
1577                     try_to_del_timer_sync(&p->timer) >= 0)
1578                         mod_timer(&p->timer, now + max_delay);
1579         }
1580
1581 out:
1582         spin_unlock(&br->multicast_lock);
1583         return err;
1584 }
1585 #endif
1586
1587 static void
1588 br_multicast_leave_group(struct net_bridge *br,
1589                          struct net_bridge_port *port,
1590                          struct br_ip *group,
1591                          struct bridge_mcast_other_query *other_query,
1592                          struct bridge_mcast_own_query *own_query,
1593                          const unsigned char *src)
1594 {
1595         struct net_bridge_mdb_htable *mdb;
1596         struct net_bridge_mdb_entry *mp;
1597         struct net_bridge_port_group *p;
1598         unsigned long now;
1599         unsigned long time;
1600
1601         spin_lock(&br->multicast_lock);
1602         if (!netif_running(br->dev) ||
1603             (port && port->state == BR_STATE_DISABLED))
1604                 goto out;
1605
1606         mdb = mlock_dereference(br->mdb, br);
1607         mp = br_mdb_ip_get(mdb, group);
1608         if (!mp)
1609                 goto out;
1610
1611         if (port && (port->flags & BR_MULTICAST_FAST_LEAVE)) {
1612                 struct net_bridge_port_group __rcu **pp;
1613
1614                 for (pp = &mp->ports;
1615                      (p = mlock_dereference(*pp, br)) != NULL;
1616                      pp = &p->next) {
1617                         if (!br_port_group_equal(p, port, src))
1618                                 continue;
1619
1620                         rcu_assign_pointer(*pp, p->next);
1621                         hlist_del_init(&p->mglist);
1622                         del_timer(&p->timer);
1623                         call_rcu_bh(&p->rcu, br_multicast_free_pg);
1624                         br_mdb_notify(br->dev, port, group, RTM_DELMDB,
1625                                       p->flags);
1626
1627                         if (!mp->ports && !mp->host_joined &&
1628                             netif_running(br->dev))
1629                                 mod_timer(&mp->timer, jiffies);
1630                 }
1631                 goto out;
1632         }
1633
1634         if (timer_pending(&other_query->timer))
1635                 goto out;
1636
1637         if (br->multicast_querier) {
1638                 __br_multicast_send_query(br, port, &mp->addr);
1639
1640                 time = jiffies + br->multicast_last_member_count *
1641                                  br->multicast_last_member_interval;
1642
1643                 mod_timer(&own_query->timer, time);
1644
1645                 for (p = mlock_dereference(mp->ports, br);
1646                      p != NULL;
1647                      p = mlock_dereference(p->next, br)) {
1648                         if (!br_port_group_equal(p, port, src))
1649                                 continue;
1650
1651                         if (!hlist_unhashed(&p->mglist) &&
1652                             (timer_pending(&p->timer) ?
1653                              time_after(p->timer.expires, time) :
1654                              try_to_del_timer_sync(&p->timer) >= 0)) {
1655                                 mod_timer(&p->timer, time);
1656                         }
1657
1658                         break;
1659                 }
1660         }
1661
1662         now = jiffies;
1663         time = now + br->multicast_last_member_count *
1664                      br->multicast_last_member_interval;
1665
1666         if (!port) {
1667                 if (mp->host_joined &&
1668                     (timer_pending(&mp->timer) ?
1669                      time_after(mp->timer.expires, time) :
1670                      try_to_del_timer_sync(&mp->timer) >= 0)) {
1671                         mod_timer(&mp->timer, time);
1672                 }
1673
1674                 goto out;
1675         }
1676
1677         for (p = mlock_dereference(mp->ports, br);
1678              p != NULL;
1679              p = mlock_dereference(p->next, br)) {
1680                 if (p->port != port)
1681                         continue;
1682
1683                 if (!hlist_unhashed(&p->mglist) &&
1684                     (timer_pending(&p->timer) ?
1685                      time_after(p->timer.expires, time) :
1686                      try_to_del_timer_sync(&p->timer) >= 0)) {
1687                         mod_timer(&p->timer, time);
1688                 }
1689
1690                 break;
1691         }
1692 out:
1693         spin_unlock(&br->multicast_lock);
1694 }
1695
1696 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1697                                          struct net_bridge_port *port,
1698                                          __be32 group,
1699                                          __u16 vid,
1700                                          const unsigned char *src)
1701 {
1702         struct br_ip br_group;
1703         struct bridge_mcast_own_query *own_query;
1704
1705         if (ipv4_is_local_multicast(group))
1706                 return;
1707
1708         own_query = port ? &port->ip4_own_query : &br->ip4_own_query;
1709
1710         br_group.u.ip4 = group;
1711         br_group.proto = htons(ETH_P_IP);
1712         br_group.vid = vid;
1713
1714         br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
1715                                  own_query, src);
1716 }
1717
1718 #if IS_ENABLED(CONFIG_IPV6)
1719 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1720                                          struct net_bridge_port *port,
1721                                          const struct in6_addr *group,
1722                                          __u16 vid,
1723                                          const unsigned char *src)
1724 {
1725         struct br_ip br_group;
1726         struct bridge_mcast_own_query *own_query;
1727
1728         if (ipv6_addr_is_ll_all_nodes(group))
1729                 return;
1730
1731         own_query = port ? &port->ip6_own_query : &br->ip6_own_query;
1732
1733         br_group.u.ip6 = *group;
1734         br_group.proto = htons(ETH_P_IPV6);
1735         br_group.vid = vid;
1736
1737         br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
1738                                  own_query, src);
1739 }
1740 #endif
1741
1742 static void br_multicast_err_count(const struct net_bridge *br,
1743                                    const struct net_bridge_port *p,
1744                                    __be16 proto)
1745 {
1746         struct bridge_mcast_stats __percpu *stats;
1747         struct bridge_mcast_stats *pstats;
1748
1749         if (!br->multicast_stats_enabled)
1750                 return;
1751
1752         if (p)
1753                 stats = p->mcast_stats;
1754         else
1755                 stats = br->mcast_stats;
1756         if (WARN_ON(!stats))
1757                 return;
1758
1759         pstats = this_cpu_ptr(stats);
1760
1761         u64_stats_update_begin(&pstats->syncp);
1762         switch (proto) {
1763         case htons(ETH_P_IP):
1764                 pstats->mstats.igmp_parse_errors++;
1765                 break;
1766 #if IS_ENABLED(CONFIG_IPV6)
1767         case htons(ETH_P_IPV6):
1768                 pstats->mstats.mld_parse_errors++;
1769                 break;
1770 #endif
1771         }
1772         u64_stats_update_end(&pstats->syncp);
1773 }
1774
1775 static void br_multicast_pim(struct net_bridge *br,
1776                              struct net_bridge_port *port,
1777                              const struct sk_buff *skb)
1778 {
1779         unsigned int offset = skb_transport_offset(skb);
1780         struct pimhdr *pimhdr, _pimhdr;
1781
1782         pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
1783         if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
1784             pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
1785                 return;
1786
1787         br_multicast_mark_router(br, port);
1788 }
1789
1790 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1791                                  struct net_bridge_port *port,
1792                                  struct sk_buff *skb,
1793                                  u16 vid)
1794 {
1795         struct sk_buff *skb_trimmed = NULL;
1796         const unsigned char *src;
1797         struct igmphdr *ih;
1798         int err;
1799
1800         err = ip_mc_check_igmp(skb, &skb_trimmed);
1801
1802         if (err == -ENOMSG) {
1803                 if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
1804                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1805                 } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
1806                         if (ip_hdr(skb)->protocol == IPPROTO_PIM)
1807                                 br_multicast_pim(br, port, skb);
1808                 }
1809                 return 0;
1810         } else if (err < 0) {
1811                 br_multicast_err_count(br, port, skb->protocol);
1812                 return err;
1813         }
1814
1815         ih = igmp_hdr(skb);
1816         src = eth_hdr(skb)->h_source;
1817         BR_INPUT_SKB_CB(skb)->igmp = ih->type;
1818
1819         switch (ih->type) {
1820         case IGMP_HOST_MEMBERSHIP_REPORT:
1821         case IGMPV2_HOST_MEMBERSHIP_REPORT:
1822                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1823                 err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
1824                 break;
1825         case IGMPV3_HOST_MEMBERSHIP_REPORT:
1826                 err = br_ip4_multicast_igmp3_report(br, port, skb_trimmed, vid);
1827                 break;
1828         case IGMP_HOST_MEMBERSHIP_QUERY:
1829                 br_ip4_multicast_query(br, port, skb_trimmed, vid);
1830                 break;
1831         case IGMP_HOST_LEAVE_MESSAGE:
1832                 br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
1833                 break;
1834         }
1835
1836         if (skb_trimmed && skb_trimmed != skb)
1837                 kfree_skb(skb_trimmed);
1838
1839         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1840                            BR_MCAST_DIR_RX);
1841
1842         return err;
1843 }
1844
1845 #if IS_ENABLED(CONFIG_IPV6)
1846 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1847                                  struct net_bridge_port *port,
1848                                  struct sk_buff *skb,
1849                                  u16 vid)
1850 {
1851         struct sk_buff *skb_trimmed = NULL;
1852         const unsigned char *src;
1853         struct mld_msg *mld;
1854         int err;
1855
1856         err = ipv6_mc_check_mld(skb, &skb_trimmed);
1857
1858         if (err == -ENOMSG) {
1859                 if (!ipv6_addr_is_ll_all_nodes(&ipv6_hdr(skb)->daddr))
1860                         BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1861                 return 0;
1862         } else if (err < 0) {
1863                 br_multicast_err_count(br, port, skb->protocol);
1864                 return err;
1865         }
1866
1867         mld = (struct mld_msg *)skb_transport_header(skb);
1868         BR_INPUT_SKB_CB(skb)->igmp = mld->mld_type;
1869
1870         switch (mld->mld_type) {
1871         case ICMPV6_MGM_REPORT:
1872                 src = eth_hdr(skb)->h_source;
1873                 BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
1874                 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca, vid,
1875                                                  src);
1876                 break;
1877         case ICMPV6_MLD2_REPORT:
1878                 err = br_ip6_multicast_mld2_report(br, port, skb_trimmed, vid);
1879                 break;
1880         case ICMPV6_MGM_QUERY:
1881                 err = br_ip6_multicast_query(br, port, skb_trimmed, vid);
1882                 break;
1883         case ICMPV6_MGM_REDUCTION:
1884                 src = eth_hdr(skb)->h_source;
1885                 br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
1886                 break;
1887         }
1888
1889         if (skb_trimmed && skb_trimmed != skb)
1890                 kfree_skb(skb_trimmed);
1891
1892         br_multicast_count(br, port, skb, BR_INPUT_SKB_CB(skb)->igmp,
1893                            BR_MCAST_DIR_RX);
1894
1895         return err;
1896 }
1897 #endif
1898
1899 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1900                      struct sk_buff *skb, u16 vid)
1901 {
1902         int ret = 0;
1903
1904         BR_INPUT_SKB_CB(skb)->igmp = 0;
1905         BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1906
1907         if (br->multicast_disabled)
1908                 return 0;
1909
1910         switch (skb->protocol) {
1911         case htons(ETH_P_IP):
1912                 ret = br_multicast_ipv4_rcv(br, port, skb, vid);
1913                 break;
1914 #if IS_ENABLED(CONFIG_IPV6)
1915         case htons(ETH_P_IPV6):
1916                 ret = br_multicast_ipv6_rcv(br, port, skb, vid);
1917                 break;
1918 #endif
1919         }
1920
1921         return ret;
1922 }
1923
1924 static void br_multicast_query_expired(struct net_bridge *br,
1925                                        struct bridge_mcast_own_query *query,
1926                                        struct bridge_mcast_querier *querier)
1927 {
1928         spin_lock(&br->multicast_lock);
1929         if (query->startup_sent < br->multicast_startup_query_count)
1930                 query->startup_sent++;
1931
1932         RCU_INIT_POINTER(querier->port, NULL);
1933         br_multicast_send_query(br, NULL, query);
1934         spin_unlock(&br->multicast_lock);
1935 }
1936
1937 static void br_ip4_multicast_query_expired(struct timer_list *t)
1938 {
1939         struct net_bridge *br = from_timer(br, t, ip4_own_query.timer);
1940
1941         br_multicast_query_expired(br, &br->ip4_own_query, &br->ip4_querier);
1942 }
1943
1944 #if IS_ENABLED(CONFIG_IPV6)
1945 static void br_ip6_multicast_query_expired(struct timer_list *t)
1946 {
1947         struct net_bridge *br = from_timer(br, t, ip6_own_query.timer);
1948
1949         br_multicast_query_expired(br, &br->ip6_own_query, &br->ip6_querier);
1950 }
1951 #endif
1952
1953 void br_multicast_init(struct net_bridge *br)
1954 {
1955         br->hash_elasticity = 4;
1956         br->hash_max = 512;
1957
1958         br->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
1959         br->multicast_querier = 0;
1960         br->multicast_query_use_ifaddr = 0;
1961         br->multicast_last_member_count = 2;
1962         br->multicast_startup_query_count = 2;
1963
1964         br->multicast_last_member_interval = HZ;
1965         br->multicast_query_response_interval = 10 * HZ;
1966         br->multicast_startup_query_interval = 125 * HZ / 4;
1967         br->multicast_query_interval = 125 * HZ;
1968         br->multicast_querier_interval = 255 * HZ;
1969         br->multicast_membership_interval = 260 * HZ;
1970
1971         br->ip4_other_query.delay_time = 0;
1972         br->ip4_querier.port = NULL;
1973         br->multicast_igmp_version = 2;
1974 #if IS_ENABLED(CONFIG_IPV6)
1975         br->multicast_mld_version = 1;
1976         br->ip6_other_query.delay_time = 0;
1977         br->ip6_querier.port = NULL;
1978 #endif
1979         br->has_ipv6_addr = 1;
1980
1981         spin_lock_init(&br->multicast_lock);
1982         timer_setup(&br->multicast_router_timer,
1983                     br_multicast_local_router_expired, 0);
1984         timer_setup(&br->ip4_other_query.timer,
1985                     br_ip4_multicast_querier_expired, 0);
1986         timer_setup(&br->ip4_own_query.timer,
1987                     br_ip4_multicast_query_expired, 0);
1988 #if IS_ENABLED(CONFIG_IPV6)
1989         timer_setup(&br->ip6_other_query.timer,
1990                     br_ip6_multicast_querier_expired, 0);
1991         timer_setup(&br->ip6_own_query.timer,
1992                     br_ip6_multicast_query_expired, 0);
1993 #endif
1994 }
1995
1996 static void __br_multicast_open(struct net_bridge *br,
1997                                 struct bridge_mcast_own_query *query)
1998 {
1999         query->startup_sent = 0;
2000
2001         if (br->multicast_disabled)
2002                 return;
2003
2004         mod_timer(&query->timer, jiffies);
2005 }
2006
2007 void br_multicast_open(struct net_bridge *br)
2008 {
2009         __br_multicast_open(br, &br->ip4_own_query);
2010 #if IS_ENABLED(CONFIG_IPV6)
2011         __br_multicast_open(br, &br->ip6_own_query);
2012 #endif
2013 }
2014
2015 void br_multicast_stop(struct net_bridge *br)
2016 {
2017         del_timer_sync(&br->multicast_router_timer);
2018         del_timer_sync(&br->ip4_other_query.timer);
2019         del_timer_sync(&br->ip4_own_query.timer);
2020 #if IS_ENABLED(CONFIG_IPV6)
2021         del_timer_sync(&br->ip6_other_query.timer);
2022         del_timer_sync(&br->ip6_own_query.timer);
2023 #endif
2024 }
2025
2026 void br_multicast_dev_del(struct net_bridge *br)
2027 {
2028         struct net_bridge_mdb_htable *mdb;
2029         struct net_bridge_mdb_entry *mp;
2030         struct hlist_node *n;
2031         u32 ver;
2032         int i;
2033
2034         spin_lock_bh(&br->multicast_lock);
2035         mdb = mlock_dereference(br->mdb, br);
2036         if (!mdb)
2037                 goto out;
2038
2039         br->mdb = NULL;
2040
2041         ver = mdb->ver;
2042         for (i = 0; i < mdb->max; i++) {
2043                 hlist_for_each_entry_safe(mp, n, &mdb->mhash[i],
2044                                           hlist[ver]) {
2045                         del_timer(&mp->timer);
2046                         call_rcu_bh(&mp->rcu, br_multicast_free_group);
2047                 }
2048         }
2049
2050         if (mdb->old) {
2051                 spin_unlock_bh(&br->multicast_lock);
2052                 rcu_barrier_bh();
2053                 spin_lock_bh(&br->multicast_lock);
2054                 WARN_ON(mdb->old);
2055         }
2056
2057         mdb->old = mdb;
2058         call_rcu_bh(&mdb->rcu, br_mdb_free);
2059
2060 out:
2061         spin_unlock_bh(&br->multicast_lock);
2062 }
2063
2064 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
2065 {
2066         int err = -EINVAL;
2067
2068         spin_lock_bh(&br->multicast_lock);
2069
2070         switch (val) {
2071         case MDB_RTR_TYPE_DISABLED:
2072         case MDB_RTR_TYPE_PERM:
2073                 br_mc_router_state_change(br, val == MDB_RTR_TYPE_PERM);
2074                 del_timer(&br->multicast_router_timer);
2075                 br->multicast_router = val;
2076                 err = 0;
2077                 break;
2078         case MDB_RTR_TYPE_TEMP_QUERY:
2079                 if (br->multicast_router != MDB_RTR_TYPE_TEMP_QUERY)
2080                         br_mc_router_state_change(br, false);
2081                 br->multicast_router = val;
2082                 err = 0;
2083                 break;
2084         }
2085
2086         spin_unlock_bh(&br->multicast_lock);
2087
2088         return err;
2089 }
2090
2091 static void __del_port_router(struct net_bridge_port *p)
2092 {
2093         if (hlist_unhashed(&p->rlist))
2094                 return;
2095         hlist_del_init_rcu(&p->rlist);
2096         br_rtr_notify(p->br->dev, p, RTM_DELMDB);
2097         br_port_mc_router_state_change(p, false);
2098
2099         /* don't allow timer refresh */
2100         if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2101                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2102 }
2103
2104 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
2105 {
2106         struct net_bridge *br = p->br;
2107         unsigned long now = jiffies;
2108         int err = -EINVAL;
2109
2110         spin_lock(&br->multicast_lock);
2111         if (p->multicast_router == val) {
2112                 /* Refresh the temp router port timer */
2113                 if (p->multicast_router == MDB_RTR_TYPE_TEMP)
2114                         mod_timer(&p->multicast_router_timer,
2115                                   now + br->multicast_querier_interval);
2116                 err = 0;
2117                 goto unlock;
2118         }
2119         switch (val) {
2120         case MDB_RTR_TYPE_DISABLED:
2121                 p->multicast_router = MDB_RTR_TYPE_DISABLED;
2122                 __del_port_router(p);
2123                 del_timer(&p->multicast_router_timer);
2124                 break;
2125         case MDB_RTR_TYPE_TEMP_QUERY:
2126                 p->multicast_router = MDB_RTR_TYPE_TEMP_QUERY;
2127                 __del_port_router(p);
2128                 break;
2129         case MDB_RTR_TYPE_PERM:
2130                 p->multicast_router = MDB_RTR_TYPE_PERM;
2131                 del_timer(&p->multicast_router_timer);
2132                 br_multicast_add_router(br, p);
2133                 break;
2134         case MDB_RTR_TYPE_TEMP:
2135                 p->multicast_router = MDB_RTR_TYPE_TEMP;
2136                 br_multicast_mark_router(br, p);
2137                 break;
2138         default:
2139                 goto unlock;
2140         }
2141         err = 0;
2142 unlock:
2143         spin_unlock(&br->multicast_lock);
2144
2145         return err;
2146 }
2147
2148 static void br_multicast_start_querier(struct net_bridge *br,
2149                                        struct bridge_mcast_own_query *query)
2150 {
2151         struct net_bridge_port *port;
2152
2153         __br_multicast_open(br, query);
2154
2155         list_for_each_entry(port, &br->port_list, list) {
2156                 if (port->state == BR_STATE_DISABLED ||
2157                     port->state == BR_STATE_BLOCKING)
2158                         continue;
2159
2160                 if (query == &br->ip4_own_query)
2161                         br_multicast_enable(&port->ip4_own_query);
2162 #if IS_ENABLED(CONFIG_IPV6)
2163                 else
2164                         br_multicast_enable(&port->ip6_own_query);
2165 #endif
2166         }
2167 }
2168
2169 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
2170 {
2171         struct net_bridge_mdb_htable *mdb;
2172         struct net_bridge_port *port;
2173         int err = 0;
2174
2175         spin_lock_bh(&br->multicast_lock);
2176         if (br->multicast_disabled == !val)
2177                 goto unlock;
2178
2179         br_mc_disabled_update(br->dev, !val);
2180         br->multicast_disabled = !val;
2181         if (br->multicast_disabled)
2182                 goto unlock;
2183
2184         if (!netif_running(br->dev))
2185                 goto unlock;
2186
2187         mdb = mlock_dereference(br->mdb, br);
2188         if (mdb) {
2189                 if (mdb->old) {
2190                         err = -EEXIST;
2191 rollback:
2192                         br->multicast_disabled = !!val;
2193                         goto unlock;
2194                 }
2195
2196                 err = br_mdb_rehash(&br->mdb, mdb->max,
2197                                     br->hash_elasticity);
2198                 if (err)
2199                         goto rollback;
2200         }
2201
2202         br_multicast_open(br);
2203         list_for_each_entry(port, &br->port_list, list)
2204                 __br_multicast_enable_port(port);
2205
2206 unlock:
2207         spin_unlock_bh(&br->multicast_lock);
2208
2209         return err;
2210 }
2211
2212 bool br_multicast_enabled(const struct net_device *dev)
2213 {
2214         struct net_bridge *br = netdev_priv(dev);
2215
2216         return !br->multicast_disabled;
2217 }
2218 EXPORT_SYMBOL_GPL(br_multicast_enabled);
2219
2220 bool br_multicast_router(const struct net_device *dev)
2221 {
2222         struct net_bridge *br = netdev_priv(dev);
2223         bool is_router;
2224
2225         spin_lock_bh(&br->multicast_lock);
2226         is_router = br_multicast_is_router(br);
2227         spin_unlock_bh(&br->multicast_lock);
2228         return is_router;
2229 }
2230 EXPORT_SYMBOL_GPL(br_multicast_router);
2231
2232 int br_multicast_set_querier(struct net_bridge *br, unsigned long val)
2233 {
2234         unsigned long max_delay;
2235
2236         val = !!val;
2237
2238         spin_lock_bh(&br->multicast_lock);
2239         if (br->multicast_querier == val)
2240                 goto unlock;
2241
2242         br->multicast_querier = val;
2243         if (!val)
2244                 goto unlock;
2245
2246         max_delay = br->multicast_query_response_interval;
2247
2248         if (!timer_pending(&br->ip4_other_query.timer))
2249                 br->ip4_other_query.delay_time = jiffies + max_delay;
2250
2251         br_multicast_start_querier(br, &br->ip4_own_query);
2252
2253 #if IS_ENABLED(CONFIG_IPV6)
2254         if (!timer_pending(&br->ip6_other_query.timer))
2255                 br->ip6_other_query.delay_time = jiffies + max_delay;
2256
2257         br_multicast_start_querier(br, &br->ip6_own_query);
2258 #endif
2259
2260 unlock:
2261         spin_unlock_bh(&br->multicast_lock);
2262
2263         return 0;
2264 }
2265
2266 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
2267 {
2268         int err = -EINVAL;
2269         u32 old;
2270         struct net_bridge_mdb_htable *mdb;
2271
2272         spin_lock_bh(&br->multicast_lock);
2273         if (!is_power_of_2(val))
2274                 goto unlock;
2275
2276         mdb = mlock_dereference(br->mdb, br);
2277         if (mdb && val < mdb->size)
2278                 goto unlock;
2279
2280         err = 0;
2281
2282         old = br->hash_max;
2283         br->hash_max = val;
2284
2285         if (mdb) {
2286                 if (mdb->old) {
2287                         err = -EEXIST;
2288 rollback:
2289                         br->hash_max = old;
2290                         goto unlock;
2291                 }
2292
2293                 err = br_mdb_rehash(&br->mdb, br->hash_max,
2294                                     br->hash_elasticity);
2295                 if (err)
2296                         goto rollback;
2297         }
2298
2299 unlock:
2300         spin_unlock_bh(&br->multicast_lock);
2301
2302         return err;
2303 }
2304
2305 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val)
2306 {
2307         /* Currently we support only version 2 and 3 */
2308         switch (val) {
2309         case 2:
2310         case 3:
2311                 break;
2312         default:
2313                 return -EINVAL;
2314         }
2315
2316         spin_lock_bh(&br->multicast_lock);
2317         br->multicast_igmp_version = val;
2318         spin_unlock_bh(&br->multicast_lock);
2319
2320         return 0;
2321 }
2322
2323 #if IS_ENABLED(CONFIG_IPV6)
2324 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val)
2325 {
2326         /* Currently we support version 1 and 2 */
2327         switch (val) {
2328         case 1:
2329         case 2:
2330                 break;
2331         default:
2332                 return -EINVAL;
2333         }
2334
2335         spin_lock_bh(&br->multicast_lock);
2336         br->multicast_mld_version = val;
2337         spin_unlock_bh(&br->multicast_lock);
2338
2339         return 0;
2340 }
2341 #endif
2342
2343 /**
2344  * br_multicast_list_adjacent - Returns snooped multicast addresses
2345  * @dev:        The bridge port adjacent to which to retrieve addresses
2346  * @br_ip_list: The list to store found, snooped multicast IP addresses in
2347  *
2348  * Creates a list of IP addresses (struct br_ip_list) sensed by the multicast
2349  * snooping feature on all bridge ports of dev's bridge device, excluding
2350  * the addresses from dev itself.
2351  *
2352  * Returns the number of items added to br_ip_list.
2353  *
2354  * Notes:
2355  * - br_ip_list needs to be initialized by caller
2356  * - br_ip_list might contain duplicates in the end
2357  *   (needs to be taken care of by caller)
2358  * - br_ip_list needs to be freed by caller
2359  */
2360 int br_multicast_list_adjacent(struct net_device *dev,
2361                                struct list_head *br_ip_list)
2362 {
2363         struct net_bridge *br;
2364         struct net_bridge_port *port;
2365         struct net_bridge_port_group *group;
2366         struct br_ip_list *entry;
2367         int count = 0;
2368
2369         rcu_read_lock();
2370         if (!br_ip_list || !br_port_exists(dev))
2371                 goto unlock;
2372
2373         port = br_port_get_rcu(dev);
2374         if (!port || !port->br)
2375                 goto unlock;
2376
2377         br = port->br;
2378
2379         list_for_each_entry_rcu(port, &br->port_list, list) {
2380                 if (!port->dev || port->dev == dev)
2381                         continue;
2382
2383                 hlist_for_each_entry_rcu(group, &port->mglist, mglist) {
2384                         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
2385                         if (!entry)
2386                                 goto unlock;
2387
2388                         entry->addr = group->addr;
2389                         list_add(&entry->list, br_ip_list);
2390                         count++;
2391                 }
2392         }
2393
2394 unlock:
2395         rcu_read_unlock();
2396         return count;
2397 }
2398 EXPORT_SYMBOL_GPL(br_multicast_list_adjacent);
2399
2400 /**
2401  * br_multicast_has_querier_anywhere - Checks for a querier on a bridge
2402  * @dev: The bridge port providing the bridge on which to check for a querier
2403  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2404  *
2405  * Checks whether the given interface has a bridge on top and if so returns
2406  * true if a valid querier exists anywhere on the bridged link layer.
2407  * Otherwise returns false.
2408  */
2409 bool br_multicast_has_querier_anywhere(struct net_device *dev, int proto)
2410 {
2411         struct net_bridge *br;
2412         struct net_bridge_port *port;
2413         struct ethhdr eth;
2414         bool ret = false;
2415
2416         rcu_read_lock();
2417         if (!br_port_exists(dev))
2418                 goto unlock;
2419
2420         port = br_port_get_rcu(dev);
2421         if (!port || !port->br)
2422                 goto unlock;
2423
2424         br = port->br;
2425
2426         memset(&eth, 0, sizeof(eth));
2427         eth.h_proto = htons(proto);
2428
2429         ret = br_multicast_querier_exists(br, &eth);
2430
2431 unlock:
2432         rcu_read_unlock();
2433         return ret;
2434 }
2435 EXPORT_SYMBOL_GPL(br_multicast_has_querier_anywhere);
2436
2437 /**
2438  * br_multicast_has_querier_adjacent - Checks for a querier behind a bridge port
2439  * @dev: The bridge port adjacent to which to check for a querier
2440  * @proto: The protocol family to check for: IGMP -> ETH_P_IP, MLD -> ETH_P_IPV6
2441  *
2442  * Checks whether the given interface has a bridge on top and if so returns
2443  * true if a selected querier is behind one of the other ports of this
2444  * bridge. Otherwise returns false.
2445  */
2446 bool br_multicast_has_querier_adjacent(struct net_device *dev, int proto)
2447 {
2448         struct net_bridge *br;
2449         struct net_bridge_port *port;
2450         bool ret = false;
2451
2452         rcu_read_lock();
2453         if (!br_port_exists(dev))
2454                 goto unlock;
2455
2456         port = br_port_get_rcu(dev);
2457         if (!port || !port->br)
2458                 goto unlock;
2459
2460         br = port->br;
2461
2462         switch (proto) {
2463         case ETH_P_IP:
2464                 if (!timer_pending(&br->ip4_other_query.timer) ||
2465                     rcu_dereference(br->ip4_querier.port) == port)
2466                         goto unlock;
2467                 break;
2468 #if IS_ENABLED(CONFIG_IPV6)
2469         case ETH_P_IPV6:
2470                 if (!timer_pending(&br->ip6_other_query.timer) ||
2471                     rcu_dereference(br->ip6_querier.port) == port)
2472                         goto unlock;
2473                 break;
2474 #endif
2475         default:
2476                 goto unlock;
2477         }
2478
2479         ret = true;
2480 unlock:
2481         rcu_read_unlock();
2482         return ret;
2483 }
2484 EXPORT_SYMBOL_GPL(br_multicast_has_querier_adjacent);
2485
2486 static void br_mcast_stats_add(struct bridge_mcast_stats __percpu *stats,
2487                                const struct sk_buff *skb, u8 type, u8 dir)
2488 {
2489         struct bridge_mcast_stats *pstats = this_cpu_ptr(stats);
2490         __be16 proto = skb->protocol;
2491         unsigned int t_len;
2492
2493         u64_stats_update_begin(&pstats->syncp);
2494         switch (proto) {
2495         case htons(ETH_P_IP):
2496                 t_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
2497                 switch (type) {
2498                 case IGMP_HOST_MEMBERSHIP_REPORT:
2499                         pstats->mstats.igmp_v1reports[dir]++;
2500                         break;
2501                 case IGMPV2_HOST_MEMBERSHIP_REPORT:
2502                         pstats->mstats.igmp_v2reports[dir]++;
2503                         break;
2504                 case IGMPV3_HOST_MEMBERSHIP_REPORT:
2505                         pstats->mstats.igmp_v3reports[dir]++;
2506                         break;
2507                 case IGMP_HOST_MEMBERSHIP_QUERY:
2508                         if (t_len != sizeof(struct igmphdr)) {
2509                                 pstats->mstats.igmp_v3queries[dir]++;
2510                         } else {
2511                                 unsigned int offset = skb_transport_offset(skb);
2512                                 struct igmphdr *ih, _ihdr;
2513
2514                                 ih = skb_header_pointer(skb, offset,
2515                                                         sizeof(_ihdr), &_ihdr);
2516                                 if (!ih)
2517                                         break;
2518                                 if (!ih->code)
2519                                         pstats->mstats.igmp_v1queries[dir]++;
2520                                 else
2521                                         pstats->mstats.igmp_v2queries[dir]++;
2522                         }
2523                         break;
2524                 case IGMP_HOST_LEAVE_MESSAGE:
2525                         pstats->mstats.igmp_leaves[dir]++;
2526                         break;
2527                 }
2528                 break;
2529 #if IS_ENABLED(CONFIG_IPV6)
2530         case htons(ETH_P_IPV6):
2531                 t_len = ntohs(ipv6_hdr(skb)->payload_len) +
2532                         sizeof(struct ipv6hdr);
2533                 t_len -= skb_network_header_len(skb);
2534                 switch (type) {
2535                 case ICMPV6_MGM_REPORT:
2536                         pstats->mstats.mld_v1reports[dir]++;
2537                         break;
2538                 case ICMPV6_MLD2_REPORT:
2539                         pstats->mstats.mld_v2reports[dir]++;
2540                         break;
2541                 case ICMPV6_MGM_QUERY:
2542                         if (t_len != sizeof(struct mld_msg))
2543                                 pstats->mstats.mld_v2queries[dir]++;
2544                         else
2545                                 pstats->mstats.mld_v1queries[dir]++;
2546                         break;
2547                 case ICMPV6_MGM_REDUCTION:
2548                         pstats->mstats.mld_leaves[dir]++;
2549                         break;
2550                 }
2551                 break;
2552 #endif /* CONFIG_IPV6 */
2553         }
2554         u64_stats_update_end(&pstats->syncp);
2555 }
2556
2557 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
2558                         const struct sk_buff *skb, u8 type, u8 dir)
2559 {
2560         struct bridge_mcast_stats __percpu *stats;
2561
2562         /* if multicast_disabled is true then igmp type can't be set */
2563         if (!type || !br->multicast_stats_enabled)
2564                 return;
2565
2566         if (p)
2567                 stats = p->mcast_stats;
2568         else
2569                 stats = br->mcast_stats;
2570         if (WARN_ON(!stats))
2571                 return;
2572
2573         br_mcast_stats_add(stats, skb, type, dir);
2574 }
2575
2576 int br_multicast_init_stats(struct net_bridge *br)
2577 {
2578         br->mcast_stats = netdev_alloc_pcpu_stats(struct bridge_mcast_stats);
2579         if (!br->mcast_stats)
2580                 return -ENOMEM;
2581
2582         return 0;
2583 }
2584
2585 void br_multicast_uninit_stats(struct net_bridge *br)
2586 {
2587         free_percpu(br->mcast_stats);
2588 }
2589
2590 static void mcast_stats_add_dir(u64 *dst, u64 *src)
2591 {
2592         dst[BR_MCAST_DIR_RX] += src[BR_MCAST_DIR_RX];
2593         dst[BR_MCAST_DIR_TX] += src[BR_MCAST_DIR_TX];
2594 }
2595
2596 void br_multicast_get_stats(const struct net_bridge *br,
2597                             const struct net_bridge_port *p,
2598                             struct br_mcast_stats *dest)
2599 {
2600         struct bridge_mcast_stats __percpu *stats;
2601         struct br_mcast_stats tdst;
2602         int i;
2603
2604         memset(dest, 0, sizeof(*dest));
2605         if (p)
2606                 stats = p->mcast_stats;
2607         else
2608                 stats = br->mcast_stats;
2609         if (WARN_ON(!stats))
2610                 return;
2611
2612         memset(&tdst, 0, sizeof(tdst));
2613         for_each_possible_cpu(i) {
2614                 struct bridge_mcast_stats *cpu_stats = per_cpu_ptr(stats, i);
2615                 struct br_mcast_stats temp;
2616                 unsigned int start;
2617
2618                 do {
2619                         start = u64_stats_fetch_begin_irq(&cpu_stats->syncp);
2620                         memcpy(&temp, &cpu_stats->mstats, sizeof(temp));
2621                 } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start));
2622
2623                 mcast_stats_add_dir(tdst.igmp_v1queries, temp.igmp_v1queries);
2624                 mcast_stats_add_dir(tdst.igmp_v2queries, temp.igmp_v2queries);
2625                 mcast_stats_add_dir(tdst.igmp_v3queries, temp.igmp_v3queries);
2626                 mcast_stats_add_dir(tdst.igmp_leaves, temp.igmp_leaves);
2627                 mcast_stats_add_dir(tdst.igmp_v1reports, temp.igmp_v1reports);
2628                 mcast_stats_add_dir(tdst.igmp_v2reports, temp.igmp_v2reports);
2629                 mcast_stats_add_dir(tdst.igmp_v3reports, temp.igmp_v3reports);
2630                 tdst.igmp_parse_errors += temp.igmp_parse_errors;
2631
2632                 mcast_stats_add_dir(tdst.mld_v1queries, temp.mld_v1queries);
2633                 mcast_stats_add_dir(tdst.mld_v2queries, temp.mld_v2queries);
2634                 mcast_stats_add_dir(tdst.mld_leaves, temp.mld_leaves);
2635                 mcast_stats_add_dir(tdst.mld_v1reports, temp.mld_v1reports);
2636                 mcast_stats_add_dir(tdst.mld_v2reports, temp.mld_v2reports);
2637                 tdst.mld_parse_errors += temp.mld_parse_errors;
2638         }
2639         memcpy(dest, &tdst, sizeof(*dest));
2640 }